I work as a senior statistician. Besides running statistical analyses, I work on several R packages. Most of them have a FOSS licence. When relevant for a larger audience, I publish the packages via CRAN or ROpenSci. You can find a list of packages at my R universe.

I monitor the R and INLA mailing lists on mixed models. If you post an question on these mailing list, I might answer them. Post a really interesting question, and I might even write a more extensive answer on my blog.